Description

Addresses code review feedback from #2425 to replace deprecated Zod .nonempty() method with .min(1) for forward compatibility with Zod v3.23+.

Updated three schema files in packages/config/src/:

• schema.include.ts - Include path validation
• schema.image-alias.ts - Image alias value validation
• schema.theme.ts - Color name and color value validation (2 occurrences)

Before:

const value = z.string().nonempty('Value cannot be empty')

After:

const value = z.string().min(1, 'Value cannot be empty')

Checklist

• I've thoroughly read the latest contribution guidelines.
• I've rebased my branch onto main before creating this PR.
• My commit messages follow conventional spec
• I've added tests to cover my changes (if applicable).
• I've verified that all new and existing tests have passed locally for mobile, tablet, and desktop screen sizes.
• My change requires documentation updates.
• I've updated the documentation accordingly.

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